APPARENT PROTEIN DIGESTIBILITY AND AMINO ACID AVAILABILITIES OF DIETARY FISH MEAL, SOYBEAN MEAL AND FULL FAT SOYBEAN IN THE NILE TILAPIA OREOCHROMIS NILOTICUS FINGERLINGS. | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 10, Volume 6, Issue 1, January 2002, Page 199-215 PDF (758.74 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2002.1734 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Ashraf Goda | ||||
| National Institute of Oceanography and Fisheries, Cairo. | ||||
| Abstract | ||||
| This study was conducted to evaluate the apparent protein digestibility and amino acid availabilities of fish meal replaced with soybean meal and full fat soybean at two levels of 50% and 75% in the.Nile tiiapia fingerlings.The carcass protein, lipid and gross energy gain were improved when dietary fish meal was replaced with soybean meal or full fat soybean at the levels of 50% than 75% .Diets containing either soybean meal (50%) or full fat soybean (50%) had the highest significant (P&0.01) value for protein digestibility coefficient than the other treatments.The over all pattern of apparent amino acids, availability corresponds to that of protein digestibility -The availability of threonine from fish meal and that of methionine of soybean meal at 75% replacement level offish meal were the lowest in the respective protein sources. Cystine availabilities of fish meal and full fat soybean at 75% replacement level were low compared with other amino acids.This study demonstrates that soybean meal or full fat soybean may used as a best source of protein in combination with fish meal in the diet for Nile tiiapia at the level up to 50% of total dietary protein, in order to ensure a favorable essential amino acid profile which closely meets the requirements. | ||||
| Keywords | ||||
| Apparent protein digestibility; amino acid availabilities; fish meal; soybean meal; full fat soybean Nile tiiapia | ||||
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